Man, that's a good one. I think for myself , i can't pick a hair or tuff of i always aim for the "armpit" as i call it about a 3" spot, any way it's usually when i know that it's a good angle and yardage and that the deer and myself are relaxed and i would say too 80 % cause it's never 100%..never really thought about it though. they always say talk yourself throughthe shot, but i can't hear over my heartbeat